Year	Number
2004-01-01	0.0811
2005-01-01	0.4864
2006-01-01	0.4864
2007-01-01	0.6486
2008-01-01	0.8918
2009-01-01	1.9051
2010-01-01	3.4049
2011-01-01	6.7694
2012-01-01	11.8362
2013-01-01	13.5387
2014-01-01	14.9574
2015-01-01	15.4033
2016-01-01	16.2140
2017-01-01	16.4572